Internal-combustion engine



Feb. 28, 1928.

E. R. BURTNETT INTBRNALtOIBUS'i'ION ENGINE Filed April 21. 1926 Patented Feb. 28, 1928.

UNITED STATES PATENT OFFICE.

nvnnnr'r a. minimum, Les ANGELES, camronnm, AssrGNon, BY. DIRECT AND ASSIG-IWEIEN S, 'ftl Til-ill AUTUMGTIVE VALVES FORNIA, A VOLUNTARY TRUST.

00., OF LOS ANGELES, CALI- INTERNALCOMBUSTION ENGINE.

Application filed April 21, 1926. Serial No. 103,532;

pumping chambers of the engine.

The valvular structure herein shown and described is particularly designed for use in the internal combustion engine structure forming the subject matter of my co-pending application for U. S. Letters Patent filed November 23, 1925, Serial No. 70,826. In-

the engine structure disclosed in my eopending application, a pair of charge volume pumping chambers are located immediately adjacent to each other with the pistons in said pumping chambers connected to crank shaft throws that are arranged approximately 180 apart so that said pistons stroke or move in direction opposite to each other, and itis the object of my present'invention to provide simple and eflicient means including a piston valve, preferably disposed between the pump chambers, for controlling the admission of gaseous fuel charge volumes to the pump chambers. l

With the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangementof parts that will hereinafter be more fully described and claimed. and illustrated in the accompanying drawing, in which- Fi 1 is a vertical section taken length wise through the center of the piston valve contemplated by my invention and showing the port arrangements between the piston valve chamber and the pumping chambers of the engine. i

Fig. 2 is a horizontal section taken on the line 2 2 of Fig. 1.

Fig. 3 is a horizontal section taken on the line 3-3 of Fig. 1. v

Referring by numerals to the accompanying drawings which illustrate a practical embodiment of my invention, 10 and 11 designate the pumping chambers of an internal combustion engine, and formed in the cylinder block between said pumping chambers is a piston valve chamber 12. Leading from the upper or head end'of the pumping Cl1l111- ber 12 downwardly through the wall of the block between said pumping chamber and the piston valve chamber 12 is a duct 15,

the lower end of which leads directly into said piston valve chambeiz. Leading from the head or upper end of pumping chamber 11 downwardly through the wall of the block between the chambers 11 and 12 is l a duct 14, the lower end of which communicates directly withthe piston valve chamber 12, but in a plane a short distance below the plane ocbupied by the lower end of duct 13. j

Arranged for reciprocatory movement within chamber 12 is a piston valve comprising a lower cylindrical portion 15 andan upper tubular extenslonxlfi. This piston valve is connected in the conventional manner to a crank on the crank shaft, and which crank is arranged so that the piston. valve willbe reoiprocated in proper time-relation to the movements of the piston within the pump chambers 10 and 11.

Secured in any suitable manner to the head end of the cylinder block or to the head of the piston valve cylinder is atubular member 17 that extends downwardly into the piston valve chamber 12 and the depending portionof this tubular member provides an internal wall for the upwardly projecting portion16 ofthepiston valve. The upper end of member 17 is connected in any suit. able manner to the source ofsupply or gaseous fuel charge volume that is drawn into the pump chambers on the suction strokes of the pistons therein. j i

Formed in the upwardly projecting tubular portion 16 of the piston valve and just above the head of the piston body 15, are oppositely arranged ports 18 and 19, and which ports are adapted to coincide respectively with the lower ends of the ducts 13 and 14.- as the piston valve is reeiprocated within its chamber 12.

Inasmuch as the lower ends of the ducts 13 and 14: occupy different horizontal planes, the lower end of duct 14 will be closed while port 18 is in communication with the lower end of duct 13 and whileport 19 is in communication with the lower end of duct 14,

the upwardly projecting portion 16 of the piston valve will close the lower end of duct of duct 13 during the downward or suction stroke of the piston in pump chamber 10, and, as a result,a charge volume will be drawn through tubular member 17, port 18, and duct 13 into the pump chamber 10 above the piston therein, and as the piston in pump chamber 10 approaches and passes low center, the piston valve will move downwardly so that port 18 moves out of registration with the lower end of duct 18, and the opposite port 19 moves into registration with the lower end of duct 14-, and which latter action takes place as the piston within pump chamber 11 starts on its downward or out ward stroke. Thus, as the piston within pump chamber 11 moves downward on its suction stroke, charge volume will be drawn through tubular member 17, port 19, and duct 14 into the pump chamber 11 above the piston therein.

During the time the piston in pump chamber 11 is moving downward on its suction stroke and the lower end of duct 13 is closed,

the piston in pump chamber 10 is moving upwardly to force the pumped charge volume through a transfer duct (not shown) to one of the combustion chambers of the engine. and in like manner, while the piston in pump chamber 10 is moving downward on its suction stroke and the lower end of duct 14': is closed, the piston in pump chamber 11 is forcing the charge volume from said chamber out through. atransfer duct to another one of the combustion chambers of the engine. V

Thus it will be seen that I have provided a relatively simple, practical, and compact valvular arrangement for controlling the admission of charge volumes to the pump chambers of a two stroke cycle internal combustion engine. I

It will be understood that minor changes in the size, form and construction of the various parts of my improved two stroke cycle internal combustion engine may be made and substituted for those herein shown and described without departing from the spirit of my invention, the scope o1 which is set forth in the appended claims.

1 claim as my invention:

1. in an internal combustion engine, a pair of charge volume pumping chambers, a piston valve chamber arranged between said pumping chambers, ducts leading from the piston valve chamber to the head ends of the pumping chambers, the ends of which ducts that lead from the piston valve chamber being located in diilerent horizontal planes, a tubular member extending into the piston valve chamber and spaced apart from the wall thereof, a piston valve arranged for reciprocatory movement within the piston valve chamber, a tubular member projecting from said piston valve into the space between the wall of said piston valve chamber and said tubular member and there being ports formed in the tubular member that projects from said piston valve which portsoccupy the ame horizontal plane.

2. In an internal combustion engine, a

pair of charge volume pumping chambers,

a piston valve chamber arranged between said pumping chambers, ducts leading from the piston valve chamber to the head ends of the pumping chambers, the ends of which ducts that lead from the piston valve chamber being located in different horizontal planes, a tubular member extending into the piston valve chamber and spaced apart from the wall thereof, a piston valve arranged for reciprocatory movement Within the piston valve chamber, a tubular member projecting from said piston valve into the .space between the Wall of said piston valve chamber and said tubular member, there being ports formed in the tubular member that projects from said piston valve, said ports occupying difierent horizontal planes and being dia metrically arranged and adapted to register with the respective offset ends of the ducts that communicate with said piston valve chamber.

In testimony whereof I alliX my signature.

EVERETT R. BURTNETT. 

